PrettyTensor's template.construct() yielding ValueError

[user55449]

For almost any call to a template's construct() method, I get

ValueError: too many values to unpack
When I run the template test file from https://github.com/google/prettytensor/blob/master/prettytensor/templated_pretty_tensor_test.py, 14 tests fail with this error. For example:

======================================================================
ERROR: testAttach (main.TemplatedPrettyTensorTest)

Traceback (most recent call last):
File "unit_test.py", line 81, in testAttach
out = self.RunTensor(input_pt.attach_template(template, 'input'))
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 750, in attach_template
return _template.as_layer().construct(**unbound_var_values)
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1248, in construct
return self._construct(context)
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1173, in _construct
method_args = self._replace_deferred(self._method_args, context)
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1145, in _replace_deferred
return [self._replace_deferred(x, context) for x in arg]
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1140, in _replace_deferred
return arg._construct(context)
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1173, in _construct
method_args = self._replace_deferred(self._method_args, context)
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1145, in _replace_deferred
return [self._replace_deferred(x, context) for x in arg]
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1140, in _replace_deferred
return arg._construct(context)
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1176, in _construct
_strip_unnecessary_contents_from_stack(result, set())
File "/opt/conda/lib/python2.7/site-packages/prettytensor/pretty_tensor_class.py", line 1335, in _strip_unnecessary_contents_from_stack
for f, line_no, method, _ in result._traceback:
ValueError: too many values to unpack
As a simpler example, the code from here does the same thing.

I'm using Tensorflow 1.2.0 and Python 2.7.1.

I've tried

pip uninstall prettytensor
pip install prettytensor
pip install prettytensor --upgrade
but the problem persists.

Context: I'm trying to use hanzhanggit's StackGAN implementation. I haven't worked with TensorFlow before.

I believe this is related to issue 53.

[shirishr]

Same issue in running Shakespeare.py with Tensorflow 1.2.1 and Python 3.5.2

[hints]

This is the output from shakespeare.py, @eiderman ?

python shakespeare.py
Starting Shakespeare
Traceback (most recent call last):
File "shakespeare.py", line 253, in
tf.app.run()
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/platform/app.py", line 48, in run
_sys.exit(main(_sys.argv[:1] + flags_passthrough))
File "shakespeare.py", line 173, in main
training_logits = create_model(inp, TIMESTEPS, pt.Phase.train)
File "shakespeare.py", line 70, in create_model
.sequence_lstm(LOWER)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1972, in method
result = func(non_seq_layer, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/recurrent_networks.py", line 125, in call
input_layer, name, state_shapes, self.template, lengths)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/recurrent_networks.py", line 383, in unroll_state_saver
out, prev_states = template(layer, *prev_states)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 493, in func
return self.construct(**values)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 461, in construct
return self.build_from_flattened(construct_all(self.flatten(), **bindings))
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 403, in construct_all
result[i] = x._construct(context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1173, in _construct
method_args = self._replace_deferred(self._method_args, context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1145, in _replace_deferred
return [self._replace_deferred(x, context) for x in arg]
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1140, in _replace_deferred
return arg._construct(context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1173, in _construct
method_args = self._replace_deferred(self._method_args, context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1145, in _replace_deferred
return [self._replace_deferred(x, context) for x in arg]
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1140, in _replace_deferred
return arg._construct(context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1173, in _construct
method_args = self._replace_deferred(self._method_args, context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1145, in _replace_deferred
return [self._replace_deferred(x, context) for x in arg]
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1140, in _replace_deferred
return arg._construct(context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1173, in _construct
method_args = self._replace_deferred(self._method_args, context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1145, in _replace_deferred
return [self._replace_deferred(x, context) for x in arg]
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1140, in _replace_deferred
return arg._construct(context)
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1176, in _construct
_strip_unnecessary_contents_from_stack(result, set())
File "/usr/local/lib/python2.7/dist-packages/prettytensor/pretty_tensor_class.py", line 1335, in _strip_unnecessary_contents_from_stack
for f, line_no, method, _ in result._traceback:
ValueError: too many values to unpack